Ries Anthony J, Hopfinger Joseph B
US Army Research Laboratory, Aberdeen Proving Ground, MD, United States.
Vision Res. 2011 Aug 15;51(16):1820-8. doi: 10.1016/j.visres.2011.06.012. Epub 2011 Jun 23.
Previous studies have provided conflicting evidence regarding whether the magnocellular (M) or parvocellular (P) visual pathway is primarily responsible for triggering involuntary orienting. Here, we used event-related potentials (ERPs) to provide new evidence that both the M and P pathways can trigger attentional capture and bias visual processing at multiple levels. Specifically, cued-location targets elicited enhanced activity, relative to uncued-location targets, at both early sensory processing levels (indexed by the P1 component) and later higher-order processing stages (as indexed by the P300 component). Furthermore, the present results show these effects of attentional capture were not contingent on the feature congruency between the cue and expected target, providing evidence that this biasing of visual processing was not dependant on top-down expectations or within-pathway priming.
先前的研究对于大细胞（M）视觉通路还是小细胞（P）视觉通路主要负责触发非自愿定向提供了相互矛盾的证据。在此，我们使用事件相关电位（ERP）来提供新的证据，表明M和P通路都可以在多个层面触发注意捕获并使视觉加工产生偏向。具体而言，相对于未提示位置的目标，提示位置的目标在早期感觉加工水平（由P1成分索引）和后期高阶加工阶段（由P300成分索引）均引发了增强的活动。此外，目前的结果表明，注意捕获的这些效应并不取决于提示与预期目标之间的特征一致性，这为视觉加工的这种偏向不依赖于自上而下的预期或通路内启动提供了证据。
